CN109565910A - Temperature sensing induction heating tool - Google Patents

Temperature sensing induction heating tool Download PDF

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Publication number
CN109565910A
CN109565910A CN201780039717.9A CN201780039717A CN109565910A CN 109565910 A CN109565910 A CN 109565910A CN 201780039717 A CN201780039717 A CN 201780039717A CN 109565910 A CN109565910 A CN 109565910A
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CN
China
Prior art keywords
workpiece
power supply
resistance
induction heating
temperature
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
CN201780039717.9A
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Chinese (zh)
Other versions
CN109565910B (en
Inventor
A·沙利塔
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Omg Co
OMG Inc
Original Assignee
Omg Co
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Publication date
Application filed by Omg Co filed Critical Omg Co
Publication of CN109565910A publication Critical patent/CN109565910A/en
Application granted granted Critical
Publication of CN109565910B publication Critical patent/CN109565910B/en
Active legal-status Critical Current
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    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B6/00—Heating by electric, magnetic or electromagnetic fields
    • H05B6/02—Induction heating
    • H05B6/10—Induction heating apparatus, other than furnaces, for specific applications
    • H05B6/105—Induction heating apparatus, other than furnaces, for specific applications using a susceptor
    • E—FIXED CONSTRUCTIONS
    • E04—BUILDING
    • E04D—ROOF COVERINGS; SKY-LIGHTS; GUTTERS; ROOF-WORKING TOOLS
    • E04D5/00—Roof covering by making use of flexible material, e.g. supplied in roll form
    • E04D5/14—Fastening means therefor
    • E04D5/144—Mechanical fastening means
    • E04D5/145—Discrete fastening means, e.g. discs or clips
    • E—FIXED CONSTRUCTIONS
    • E04—BUILDING
    • E04D—ROOF COVERINGS; SKY-LIGHTS; GUTTERS; ROOF-WORKING TOOLS
    • E04D15/00—Apparatus or tools for roof working
    • E04D15/04—Apparatus or tools for roof working for roof coverings comprising slabs, sheets or flexible material
    • E—FIXED CONSTRUCTIONS
    • E04—BUILDING
    • E04D—ROOF COVERINGS; SKY-LIGHTS; GUTTERS; ROOF-WORKING TOOLS
    • E04D5/00—Roof covering by making use of flexible material, e.g. supplied in roll form
    • E04D5/14—Fastening means therefor
    • E04D5/144—Mechanical fastening means
    • E04D5/147—Mechanical fastening means not perforating the flexible material
    • E—FIXED CONSTRUCTIONS
    • E04—BUILDING
    • E04D—ROOF COVERINGS; SKY-LIGHTS; GUTTERS; ROOF-WORKING TOOLS
    • E04D5/00—Roof covering by making use of flexible material, e.g. supplied in roll form
    • E04D5/14—Fastening means therefor
    • E04D5/148—Fastening means therefor fastening by gluing
    • E—FIXED CONSTRUCTIONS
    • E04—BUILDING
    • E04D—ROOF COVERINGS; SKY-LIGHTS; GUTTERS; ROOF-WORKING TOOLS
    • E04D5/00—Roof covering by making use of flexible material, e.g. supplied in roll form
    • E04D5/14—Fastening means therefor
    • E04D5/149—Fastening means therefor fastening by welding
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B6/00—Heating by electric, magnetic or electromagnetic fields
    • H05B6/02—Induction heating
    • H05B6/10—Induction heating apparatus, other than furnaces, for specific applications
    • H05B6/14—Tools, e.g. nozzles, rollers, calenders
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C65/00—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor
    • B29C65/02—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure
    • B29C65/44—Joining a heated non plastics element to a plastics element
    • B29C65/46—Joining a heated non plastics element to a plastics element heated by induction
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C65/00—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor
    • B29C65/48—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor using adhesives, i.e. using supplementary joining material; solvent bonding
    • B29C65/4805—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor using adhesives, i.e. using supplementary joining material; solvent bonding characterised by the type of adhesives
    • B29C65/481—Non-reactive adhesives, e.g. physically hardening adhesives
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    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
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    • B29C65/48—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor using adhesives, i.e. using supplementary joining material; solvent bonding
    • B29C65/50—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor using adhesives, i.e. using supplementary joining material; solvent bonding using adhesive tape, e.g. thermoplastic tape; using threads or the like
    • B29C65/5057—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor using adhesives, i.e. using supplementary joining material; solvent bonding using adhesive tape, e.g. thermoplastic tape; using threads or the like positioned between the surfaces to be joined
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    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
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    • B29C65/00—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor
    • B29C65/82—Testing the joint
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    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
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    • B29C66/1122—Single lap to lap joints, i.e. overlap joints
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    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
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    • B29C66/41—Joining substantially flat articles ; Making flat seams in tubular or hollow articles
    • B29C66/43—Joining a relatively small portion of the surface of said articles
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    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/40—General aspects of joining substantially flat articles, e.g. plates, sheets or web-like materials; Making flat seams in tubular or hollow articles; Joining single elements to substantially flat surfaces
    • B29C66/47—Joining single elements to sheets, plates or other substantially flat surfaces
    • B29C66/474—Joining single elements to sheets, plates or other substantially flat surfaces said single elements being substantially non-flat
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
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    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/70—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material
    • B29C66/71—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the composition of the plastics material of the parts to be joined
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
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    • B29C66/73—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the intensive physical properties of the material of the parts to be joined, by the optical properties of the material of the parts to be joined, by the extensive physical properties of the parts to be joined, by the state of the material of the parts to be joined or by the material of the parts to be joined being a thermoplastic or a thermoset
    • B29C66/735—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the intensive physical properties of the material of the parts to be joined, by the optical properties of the material of the parts to be joined, by the extensive physical properties of the parts to be joined, by the state of the material of the parts to be joined or by the material of the parts to be joined being a thermoplastic or a thermoset characterised by the extensive physical properties of the parts to be joined
    • B29C66/7352—Thickness, e.g. very thin
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/70—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material
    • B29C66/73—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the intensive physical properties of the material of the parts to be joined, by the optical properties of the material of the parts to be joined, by the extensive physical properties of the parts to be joined, by the state of the material of the parts to be joined or by the material of the parts to be joined being a thermoplastic or a thermoset
    • B29C66/739—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the intensive physical properties of the material of the parts to be joined, by the optical properties of the material of the parts to be joined, by the extensive physical properties of the parts to be joined, by the state of the material of the parts to be joined or by the material of the parts to be joined being a thermoplastic or a thermoset characterised by the material of the parts to be joined being a thermoplastic or a thermoset
    • B29C66/7392—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the intensive physical properties of the material of the parts to be joined, by the optical properties of the material of the parts to be joined, by the extensive physical properties of the parts to be joined, by the state of the material of the parts to be joined or by the material of the parts to be joined being a thermoplastic or a thermoset characterised by the material of the parts to be joined being a thermoplastic or a thermoset characterised by the material of at least one of the parts being a thermoplastic
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    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
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    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/70—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material
    • B29C66/74—Joining plastics material to non-plastics material
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/70—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material
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    • B29C66/742—Joining plastics material to non-plastics material to metals or their alloys
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    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
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    • B29C66/80—General aspects of machine operations or constructions and parts thereof
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    • B29C66/80—General aspects of machine operations or constructions and parts thereof
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/90—Measuring or controlling the joining process
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    • B29C66/9121—Measuring or controlling the joining process by measuring or controlling the temperature, the heat or the thermal flux by measuring the temperature, the heat or the thermal flux by measuring the temperature
    • B29C66/91211—Measuring or controlling the joining process by measuring or controlling the temperature, the heat or the thermal flux by measuring the temperature, the heat or the thermal flux by measuring the temperature with special temperature measurement means or methods
    • B29C66/91214—Measuring or controlling the joining process by measuring or controlling the temperature, the heat or the thermal flux by measuring the temperature, the heat or the thermal flux by measuring the temperature with special temperature measurement means or methods by measuring the electrical resistance of a resistive element belonging to one of the parts to be welded, said element acting, e.g. as a thermistor
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
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    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
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    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
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    • B29C66/9532—Measuring or controlling the joining process by measuring or controlling specific variables not covered by groups B29C66/91 - B29C66/94 by measuring or controlling the humidity of the parts to be joined, i.e. taking the humidity of the parts to be joined into account
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/90—Measuring or controlling the joining process
    • B29C66/96—Measuring or controlling the joining process characterised by the method for implementing the controlling of the joining process
    • B29C66/961—Measuring or controlling the joining process characterised by the method for implementing the controlling of the joining process involving a feedback loop mechanism, e.g. comparison with a desired value
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29L—INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES
    • B29L2031/00—Other particular articles
    • B29L2031/10—Building elements, e.g. bricks, blocks, tiles, panels, posts, beams
    • B29L2031/108—Roofs

Abstract

A kind of induction heating tool keeps the voltage for being supplied to induced oscillation circuit or electric current constant, and another the variation during each induction heating circulation in floating voltage or electric current.The fact that disclosed induction heating tool is increased using the resistance of attachment plate with the temperature of attachment plate.During induction heating circulation, attachment plate is magnetically coupled to actuating coil, and the resistance of attachment plate is reflected into the circuit.The resistance variations of attachment plate change the energy delivery mode from actuating coil to attachment plate in a predictable manner.Calculating accurately predicts the temperature of attachment plate under various environmental conditions, the presence including moisture at film/attachment interface.Disclosed induction heating tool generates consistent result without being calibrated for environmental condition.

Description

Temperature sensing induction heating tool
Background technique
The disclosure relates generally to induction heating apparatuses, and more particularly to the type that be used to for film being fixed to roof Induction heating apparatus.
Film roof system generally includes to be fixed to roof support structure and is covered with the rigid insulation layers of waterproof membrane.Pass through Insulating materials is fixed on roof structure by the fastener across attachment disk.It is attached disk and is coated with heat activated adhesive agent material.? Before membrane material rolls across roof, which keeps inactive.Induction heating tool (such as United States Patent (USP) No.6509555 Disclosed in) it is used by disk described in film induction heating, to activate the adhesive and film is fixed to disk and roof knot Structure.
An important factor for bonding quality being attached between disk and film is finished product roof system general integrity.The target is equal Even heating attachment plate is to activate adhesive.Uneven or insufficient heating will lead to weak bonding, and insulating materials can be burnt out by overheating And/or film.The temperature of attachment plate is estimated using multiple technologies or measured to the induction heating tool of the prior art, so as to true Determine application power and the duration of induction heating circulation.The prior art is because attachment plate is located at below roof film and cannot be direct The close fact and complicate.A kind of technology uses the amount of the energy based on the actuating coil for being delivered to induction welding tool to estimate Meter is delivered to the calculating of the amount of the energy of attachment plate.The amount for being transferred to the energy of attachment plate can be used in known environment condition The temperature of lower estimation plate increases.The technology not can solve the presence (between film and attachment plate) of moisture and need to calibrate to solve Often cold or very hot environmental condition by no means.
A kind of induction heating tool is needed, the temperature of attachment plate can be accurately predicted during induction heating recycles, But regardless of between environment temperature or film and attachment plate whether there is moisture.
Summary of the invention
Disclosed induction heating tool holding is supplied to induced oscillation circuit (induction tank circuit) Voltage or electric current are constant, and another the variation during each induction heating circulation in floating voltage or electric current.It is disclosed Induction heating tool the fact that the resistance of attachment plate increases with the temperature of attachment plate is utilized.The phase is recycled in induction heating Between, the attachment plate is magnetically coupled to the actuating coil, and the resistance of attachment plate is reflected into the circuit.The electricity of attachment plate Resistiveization changes the energy delivery mode from actuating coil to attachment plate in a predictable manner.In a disclosed embodiment In, it is applied to the voltages keep constant of the induced oscillation circuit, and be delivered to the electric current of the induced oscillation circuit Variation be measured and used to calculate the temperature of the attachment plate.Experiment shows that these calculating accurately predict attachment plate Temperature under various environmental conditions, the presence including moisture at film/attachment interface.Disclosed induction heating tool generates Consistent result for environmental condition without being calibrated.
Detailed description of the invention
Figure 1A is the block diagram of the essential electrical component of an embodiment of disclosed induction heating tool；
Figure 1B is the block diagram of the essential electrical component of an alternative embodiment of disclosed induction heating tool；
Fig. 2 is the exploded perspective view of the exemplary operation coil compatible with disclosed induction heating tool；
Fig. 3 is section according to the representative film roof in conjunction with induction heating tool functionality of various aspects of the disclosure Face figure；
Fig. 4 is shown under 0 DEG C, 20 DEG C and 50 DEG C of environment temperature by disclosed induction heating tool generation The figure of adhesive strength；
Fig. 5 is applied to the current measured and target attachment plate of the actuating coil of disclosed induction heating tool The superposition of gained measurement temperature；And
Fig. 6 is the optimum target electric current and film thickness for showing the exemplary induction heating tool according to various aspects of the disclosure The figure of the relationship of degree is presented.
Specific embodiment
Figure 1A and Figure 1B is the block diagram of the essential electrical component of the embodiment of disclosed induction heating tool.Figure 1A is The block diagram 300 of the essential electrical component of the first embodiment of disclosed induction heating tool.It starts at 302 117VAC power supply (otherwise referred to as 120VAC AC power source herein), is connected to the fuse at 304 for power line, then Thermal resistor at the ON-OFF switch being connected at 306 and 308.Line voltage is applied to transformer 316, transformer 170VDC power supply 314 is provided.Power supply 314 can be buck-boost type, be configured to provide to oscillator plate 320 substantially permanent Fixed D/C voltage.Disclosed buck-boost type constant voltage 170VDC power supply is non-restrictive example, and can be using such as Battery or other power supplys of other power configurations to provide electric power to oscillator plate 320.When using battery, without 117VAC (or 120VAC) power supply.By contrast, using battery 310, DC current is provided to the inverter stage at 312, is become The power supply of 170VDC power supply 314.Battery 310 or transformer 316 are that+5VDC power supply 318 provides electric power.It is micro- for being somebody's turn to do+5 volt power supplys Other digital assemblies of processor 350 and circuit provide electric power.
The output driving power oscillator grade 322 of 170VDC power supply, power oscillator grade is DC-AC inverter.Single vibration Swinging device (printed circuit) plate 320 may include both power oscillator 322 and switching transistor 324.The output of inverter 322 is driven Dynamic actuating coil and one group of power capacitor, actuating coil and one group of power capacitor are combined into the vibration specified by label 340 Swing circuit.Temperature sensor (referred herein as RTD or resistance temperature detector) at 342 is set at actuating coil, and The output of temperature sensor 342 is directed to buffer circuit 344, and buffer circuit successively drives the input of microprocessor circuit 350. This is usually analog signal, it is therefore desirable to the A/D converter in buffer circuit 344 or in microprocessor grade 350.Temperature Sensor 342 allows tool interrupt operation in the case where coil is more than predetermined temperature.
The induction heating tool of Figure 1A utilizes multistage bar pattern display 356, and is also stored using multiple EEPROM Device chip 358.In addition, the first embodiment tool, using the RS-232 communication port at 352, RS-232 serially leads to Believe that port has the RJ-11 jack at 354.This allow induction heating tool and remote computer (in such as Figure 1A 360 at PC it) communicates.Eeprom chip, bar pattern display and serial communication protocol are non-restrictive examples, and other memories, Display and communications option are compatible with disclosed induction heating tool.
In disclosed embodiment, power supply 314 is configured to provide continuous 170VDC to oscillator plate 320.Micro- place Reason device 350 monitors the voltage and or current of the output of power supply 314 at 323.It discusses in more detail below, due to voltage It is kept constant in the output of power supply 314, thus the variation of the power of the consumption of resonance oscillatory circuit 340 is generated in power supply 314 Output measurement electric current variation.Microprocessor 350 is programmed to the change that monitoring is delivered to the electric current of oscillator plate 320 Change, and keeps these variations associated with the temperature of workpiece (for example, attachment plate).
Block diagram 301 is provided referring to Figure 1B, which it is one alternative to instantiate disclosed induction heating tool Some essential electrical components of embodiment.There is provided AC power supplies (such as 120VAC line voltage) at 370 rectifier and Filter stage power supply.DC-DC preconditioner 372 receives DC current, and DC- from the output end of rectifier/filter grade 370 AC inverter 374 receives controlled voltage level from preconditioner 372.The output of inverter 374 be used to drive induction head 376。
Incuding head 376, (Figure 1B is not shown, but it is to incude a part on head and in Fig. 2 via actuating coil Show) energy oscillation magnetic field is generated, and workpiece 390 is directed toward in the magnetic field.In the context of the disclosure, workpiece is to be located at film The attachment plate 92 of 82 lower sections, as shown in Figure 3.Attachment plate 92 another example is about 3 inches of diameter, 0.030 inch of thickness, be coated with The carbon steel plectane of heat-activatable adhesive 96.Steel attachment plate, which is placed on, leads to active line by incuding in the magnetic field that head 376 generates " coupling " relationship between 75 (referring to fig. 2) and attachment plate 92 is enclosed, wherein the row of the circuit in the magnetic field can be generated by monitoring For come the characteristic variations that detect attachment plate.Oscillating magnetic field establishes eddy current in attachment plate 92, wherein for the electricity of oscillating current Resistance generates the heating of attachment plate.As attachment plate 92 heats, the energy model which absorbs is reflected back toward induced oscillation circuit, In, the variation of applied power changes the electric current delivered from power supply.
It provides and is joined using the controller 380 of microprocessor with the voltage and or current for detecting the output end of preconditioner 372 Number 382.380 pairs of institute's sensor parameters 382 of controller respond, and determine to inverter 374 and induction head 376 and apply function The time span of rate.If desired, logic state machine can be used instead of microprocessor in controller.Moreover, entire interface and control Circuit processed can be made of simulated assembly completely, as the skilled person would expect.
Referring back to Figure 1B, during operation, rectifier/filter grade 370 receives AC electric power from AC power supplies 302.DC-DC Preconditioner 372 carries out pulsewidth modulation to the DC power signal from grade 370, to provide DC " power " signal of appropriate amplitude, To allow DC-AC inverter 374 with AC electric power excitation induction head 376 high-frequency enough, so that induction adds in workpiece 390 Heat.
In the one mode of the second preferred embodiment, DC-AC inverter 374 is to approach the fixed frequency work of 100kHz Make.Sensing voltage and/or electric current at the 382 of the output end of preconditioner 372 are fed to controller 380, and controller makes The appropriate operating parameter on induction head 376 is determined with institute's sensing voltage and/or electric current, and is provided to DC-DC preconditioner 372 Control instruction or order 384.The voltage and or current generated by preconditioner 372 changes when needed, by input power (that is, input voltage or electric current for detecting at 382) is maintained at constant predetermined value.Disclosed in induction heating tool In embodiment, actuating coil is incorporated into the resonance oscillatory circuit with unrestricted exemplary predetermined work frequency 100kHz In.It will be appreciated by those skilled in the art that induced oscillation circuit is designed to maximize the efficiency to workpiece delivering energy, thus Configuration, working frequency and the applied voltage and current of induced oscillation circuit can correspondingly change.
Fig. 2 instantiates the representative configuration of the lower part of the induction heating tool according to various aspects of the disclosure.The base of Fig. 2 Portion 50 corresponds to induction head 376 discussed above.Base portion 50 supports and includes induction coil 68 (also referred to as " actuating coil "), The induction coil is three " track type " coils 74,75,76 in disclosed embodiment.Referring to Fig. 2, induction heating work The example of the base portion 50 of tool is depicted with exploded view, and its topmost is top cover 56, and top cover further includes attachment point 58.Attachment point 58 can be attached to any form needed for induction heating tool using by base portion 50.In use, the base of induction heating tool Induction coil 68 is supported in attachment plate 92 (referring to Fig. 3) by portion 50, therefore attachment plate 92 is located at and is generated by induction coil 68 In oscillating magnetic field.It is subassemblies 55 below top cover 56, subassemblies keep a large amount of needle type heat radiator components 54.In Fig. 2, There are two such subassemblies 55, have one on every side of the cross central line of base portion 50.Below subassemblies 55 It is separator element 72, subassemblies 55 is held in place.
It is generally to specify " radiator " structure with label 70 between interval body 72 and induction coil 68.The radiator structure The thermal energy that be used to be more even distributed across and generate in induction coil 68 is made, so as to which thermal dissipation (that is, heat transmitting) can be made most Bigization.In the illustrated embodiment of Fig. 2, there are the independent heat spreader structures 70 of two panels, they abut the winding of induction coil 68. If desired, radiator can be physically contacted with induction coil 68, heat of the base portion 50 far from coil is passed through with further maximize It can transmitting (via conduction).The construction of this radiator should be as heat carrier but be also electrical insulator heat radiator structure. Certain ceramics may be used as the heat sink arrangement, and in preferable configuration of the invention, heat sink part 70 can be by nitrogenizing Aluminium is made.Base portion 50 includes bottom cover 62, and bottom cover 62 limits the lower surface of induction heating tool.It is induction in the surface of bottom cover 62 Loop construction 68.
Triple runway coils 68 are made of three elongated windings 74,75,76, and these windings can according to need series connection Ground is electrically connected or they can be connected by three parallel windings.The configuration shown in Fig. 2 in any case, winding 74, Each of 75 and 76 all have multiturn.Alternatively, three coils can be single by being arranged using three elongate forms The line of length is wound.The configuration of triple runway coils generates elongated magnetic field, and elongated magnetic field is permitted relative to keeping coil 68 attached in target Some leeway placed in the middle on fishplate bar 92.Referring to Fig. 3, the elongated shape in magnetic field means the flexibility of position in a lateral direction (plane for being parallel to Fig. 3) is bigger than in front-rear direction (perpendicular to the plane of Fig. 3).The configuration of induction coil 68 be efficiency with Compromise between ease for use.With the roof system of foil veneer rigid insulation, it is undesirable to which magnetic field extends beyond attached The circumference of fishplate bar may heat paillon and the insulating layer that burns.The theory of operation of disclosed induction heating tool is not limited to appoint What specific induction coil configuration, and shown induction coil is intended as a non-restrictive example.
Induction coil by means of the capacitor in parallel with the induction coil assisted by one or more switching transistors (or Capacitor group) with expected frequence resonance.Parallel resonance is exaggerated the electric current by induction coil, and drives the power supply of resonance circuit See sinusoidal load electric current.In this parallel resonant tank circuit, power supply only increase the resistance being lost in component or into Load current part when the work of row heating workpiece, and big operating current is positioned to induction coil and capacitor (usually One group of several capacitor).The presence of workpiece damps antiresonant circuit, and when workpiece is coupled to induction coil, from power supply The electric current drawn increases.
In practice, the effective resistance (impedance) of induction coil, the effective resistance (impedance) of oscillating capacitor and workpiece Reflected resistance can all be introduced in oscillating circuit loss and damped harmonic oscillation.The summation of these resistance can be combined into single " damage Power consumption resistance ", single loss resistance provide load to the power supply for induction heating tool.When resonating driving, by oscillating capacitance The size of current that device and induction coil (together with induced oscillation circuit) are drawn is equal and opposite in phase, therefore the power supply related to For, electric current is cancelled out each other.This means that unique load that power supply is seen at the resonant frequency fx is the damage across induced oscillation circuit Power consumption resistance.It is known to the resistance presented as capacitor and induction coil and quite stable, and as its temperature is because carrying out self-induction coil High frequency magnetic field induction eddy current and increase, substantial variations will occur for the resistance of workpiece.
The variation of workpiece resistance increases the loss resistance for oscillating circuit, and causes by induction heating tool consumption The measurable variation of power.As shown in figure 5, the electric current drawn from power supply increases with the resistance (and temperature) of workpiece.Workpiece Resistance can be associated with its temperature, therefore can be used be delivered to the electric current of oscillating circuit measurement variation come with high precision Degree calculates the temperature of (prediction) workpiece.In disclosed roof system, the characteristic of workpiece (for example, attachment plate) is known and can be with It is used to design the oscillating circuit that can effectively transfer energy in attachment plate (workpiece).As an example, carbon steel Temperature-coefficient of electrical resistance α is 0.003/ DEG C, can be used to be calculated according to the variation for the electric current for being applied to induced oscillation circuit The temperature of attachment plate.Formula for the calculating is: Rplate=R0[1+α(T-T0)], wherein R0It is in known temperature T0Under The known resistance of plate.Alternatively, can by mode store in a lookup table and by microprocessor use with by present level with it is attached Fishplate bar temperature is associated.
The plate resistance of increase makes the tool in the form of increasing Current draw to deliver more power, because power supply 314, 370/372 output voltage is fixed, and unrelated with input voltage source.The electricity that plate Wen Yucong power supply 314,370/372 is drawn There are direct relations between stream.For different film thicknesses, this relationship is different because film thickness influence coil and plate it Between coupling.Every kind of board type will also have different temperatures in need of consideration/distribution of resistance figure.Measured variable and plate temperature it Between relationship can be determined by experiment and store in a lookup table for microprocessor reference.It alternatively, can be by the relationship It is simplified to the formula applied to measured variable, with the energy delivery for determining plate temperature and controlling to plate.
Film thickness and material are also known, and can be subject in the design and operation of disclosed induction heating tool Consider.Thicker film causes the distance between induction coil and workpiece bigger, and which reduce induction coils and workpiece (accessory plate) Between magnetic coupling.The magnetic coupling of reduction between induction coil and workpiece reduces the power delivered from induction coil to workpiece Amount, which reduce the energy consumptions of the output of power supply.As shown in fig. 6, be delivered to the target current of induction coil with The increase of film thickness and reduce.Assuming that the coupling and power transfer in the case where more thick film between induction coil and attachment plate subtract Small, the time reached needed for wishing to heat is somewhat longer.Tool control enables the duration to reach target current, corresponds to In predeterminated target plate temperature.
In alternative embodiment, tool is arranged to control and enables to realize and correspond to the target electricity for wishing plate temperature Then the target current is kept predetermined period by stream.In this embodiment, which can be slightly below needed for adhesive plate Peak temperature, but heat maintains a short period of time, this allows heat to pass through plate conduction, and should lead to heating more evenly More consistent bonding between plate and plate and roof film.In another alternative embodiment, including when extended heat preservation (soak) Between feature, heat is thus kept into more long duration to ensure to be uniformly heated up adhesive plate under cold and/or moist environmental condition. The temperature of joint plate is preferably maintained at 210 ° -220 ° up to -5 seconds 0.5 second of Fahrenheit temperature by disclosed soaking time feature, with Evaporation water simultaneously removes cold and/or moist environmental condition from adhesive plate.User interface or switch has can be set in the tool, The user interface or switch can be activated to indicate temperature and/or humidity problem.The software can be set searching instruction and need The step of wanting the input of soaking time, and induction heating mode will be implemented, the induction heating mode is in the temperature for making attachment plate Before reaching about 450 °F of target temperature, the temperature of attachment plate is kept above to one predetermined period of boiling temperature of water.
In the disclosed embodiment of induction heating tool, electric power is delivered to oscillating circuit from constant voltage source.Due to electricity The voltage of the output in source does not change, thus the variation of the energy of oscillating circuit consumption leads to the output end in constant voltage source The variation for the electric current that place measures.
The primary variables of induction coil geometry is the circle of wire type, conducting wire total length, winding pattern and coil Interval between protrusion (lobe).Coil variable together with the performance variable of oscillator plate be selected to induction coil and workpiece it Between efficient coupling and power transfer are provided.The purpose of disclosed induction heating tool is to provide target attachment plate quick and one Heating is caused, hot-zone or cold-zone without interfering the bonding quality between film and attachment plate.Induction coil can wind into any The shape of quantity, each shape generate different configuration of magnetic field.The shape in induction coil and magnetic field can be with about three inches The shape of circular attachment plate matches.It matches coil shape with target shape and requires being accurately aimed at for coil and target, with Realize being evenly heated for entire target.Matching the shape in magnetic field with the shape of target can be minimized the material around target Heating, as long as coil is aligned above target.Alternatively, coil may be configured to generate the magnetic field for being greater than target, this Sample can heat entire target, without being accurately aligned with induction coil and target.
The induction coil of disclosed induction heating tool is preferably positioned as close to attachment plate, so that by induction coil The magnetic field of generation is by induction heating attachment plate.Therefore, by induction coil layout in a part of tool, which can be located at On the top of roof film, right above the position of attachment plate, as shown in Figure 3.
Referring to Fig. 3, film roof structure includes top film layer 82, and top film layer 82 may include certain type of rubber or modeling Expect compound.The main purpose of film 82 is the building for preventing water from entering using the roof.One layer of rigid thermal insulation layer 84 is located at base On plate 86.Sheet material 84 is usually kept by one group of attachment disk 92 to substrate 86, and being attached disk 92 has certain type through its installation The fastener 94 of type.If desired, attachment disk 92 can be permanently attached to its fastener 94.
In typical film roof, attachment disk 92 is circular, and has center opening, is placed by the center opening Relatively long screw 94.Then the screw is pushed into and is rotated in substrate 86, so that attachment disk is fixed to suitable position, together When also rigid insulation piece 84 is held in place by.
In the present invention, fastener 94 passes through the central opening in attachment disk 92, is subsequently passed through heat shield 84, finally enters Substrate 86.These fasteners 94 are not passed through top film layer 82.However, film layer 82 must be attached to substrate 86 in some way, with The integrality that roof is kept when being exposed to high wind, as required by construction standards.In the present invention, attachment disk 92 (usually exists In factory) it is coated with heat activated adhesive agent material.Before membrane material rolls across roof, which keeps inactive.So After make induction heating tool against one of attachment disk 92, and be activated.When this happens, induction coil 68 emits Magnetic field generates eddy current in the current-carrying part of disk 92.
In general, disk 92 includes metallics (for example, aluminium or steel), is often conductive.When the eddy current is generated, The temperature of disk 92 is increased to the degree that top adhesive 96 becomes active, and would generally melt.Then adhesive 96 will adhere to To the bottom surface of film layer 82.When induction tool 10 deactivates, whole system cools down, and adhesive 96 remains adhered to film layer 82 Bottom surface, thus " permanently " by film layer 82 be installed to attachment disk 92 top on.Since attachment disk is connected by fastener 94 It is connected to roof structure 86, thus film is operatively connected to roof structure.

Claims (18)

1. a kind of method for operating induction heating apparatus, the described method comprises the following steps:
Induction coil is set；
By capacitance connection to the induction coil, to form the oscillating circuit with resonance frequency；
The output end of power supply is connected to the oscillating circuit to motivate the oscillating circuit；
Electrically conductive workpiece is set；
The neighbouring workpiece places the induction coil；
The power supply is enabled to motivate the oscillating circuit, the oscillating circuit with the resonance frequency resonance, the resonance Oscillating circuit generates oscillating magnetic field, which issues from the induction coil, generates eddy current in the workpiece, thus Heat the workpiece；
Measure at least one variable of the output of the power supply；And
The resistance of the workpiece is calculated using the variation of at least one variable described in measured；
Keep the variation of the resistance of the workpiece associated with the temperature of the workpiece；And
Variation associated with the preset target temperature of the workpiece in response to the resistance of the workpiece calculated deactivates institute State power supply.
2. the method for operation induction heating apparatus according to claim 1, wherein the step of connecting the output end of power supply packet It includes: configuring the output voltage that the power supply is kept constant with the output in the power supply.
3. the method for operation induction heating apparatus according to claim 2, wherein measure the output end of the power supply The step of at least one variable at place includes: the electric current that measurement is drawn from the power supply, and the step of calculating includes: benefit The resistance of the workpiece is calculated with the variation of the electric current drawn from the power supply.
4. the method for operation induction heating apparatus according to claim 1, wherein the step of deactivating the power supply include: Before deactivating the power supply, the preset target temperature of the workpiece is kept in scheduled time slot.
5. the method for operation induction heating apparatus according to claim 4, wherein the step of holding includes: response In with lower than the temperature of predetermined temperature it is corresponding input or with moisture on the workpiece there are it is corresponding input come Adjust the predetermined period.
6. the method for operation induction heating apparatus according to claim 1, wherein the step of connection includes:
The power supply that there is scheduled constant output voltage or export electric current is provided, and the step of measurement includes:
Measure non-constant output voltage or output electric current.
7. a kind of for carrying out the device of induction heating to workpiece, described device includes:
Capacitor, the capacitance connection to induction coil is to form the oscillating circuit with resonance frequency；
Power supply, the power supply, which is arranged to the oscillating circuit, delivers electric power, and the power supply has scheduled constant output electricity Pressure or output electric current；
Control circuit, the control circuit are arranged to the output voltage that measurement is not kept constant or output electric current, the control Circuit is configured to keep the variation of measured output voltage or output electric current associated with the temperature of the workpiece, and
Wherein, when the association indicates that the workpiece has reached predetermined temperature, the control circuit closes the power supply.
8. device according to claim 7, wherein output voltage measured by the control circuit use or output electric current With the resistance of the determination workpiece, and the control circuit is associated with the temperature of the resistance Yu the workpiece using look-up table Degree.
9. device according to claim 7, wherein output voltage measured by the control circuit use or output electric current To calculate the temperature of the workpiece.
10. device according to claim 7, wherein the induction coil is supported on the work by the base portion of described device On part.
11. device according to claim 7, wherein the induction coil is the triple runways for including three elongated windings Coil.
12. device according to claim 7, wherein heat conduction radiator abuts the winding of the induction coil, so as to more The thermal energy generated by the induction coil is distributed evenly.
13. device according to claim 7, wherein the capacitor is connected in parallel with the induction coil, to form parallel connection Resonance oscillatory circuit.
14. device according to claim 7, wherein the resistance of the induction coil, the resistance of oscillating capacitor and institute It states the sum of resistance of workpiece and is equal to the single loss resistance that load is presented to the power supply of described device.
15. device according to claim 7, wherein the temperature raising of the workpiece causes the resistance of the workpiece to increase.
16. device according to claim 15, wherein the resistance of the workpiece increases the electricity for causing to draw from the power supply Stream increases.
17. device according to claim 7, wherein the predetermined temperature of the workpiece is kept predetermined period.
18. device according to claim 7, wherein when the workpiece is cold and/or moist, the workpiece The predetermined temperature is kept more long duration.
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WO2018005724A1 (en) 2018-01-04
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